Faying fob streets and the like



R. C. STUBBS.

PAVING FOR STREETS AND THE LIKE.

APPLICATION FILED sEPT.14,1916.

1 ,3 1 5,749. PatentedSept. 9, 1919.

. t kom w15 ROBERT C.

STUBBS, OF DALLAS, TEXAS.

PAVING FOR STREETS AND THE LIKE.

Specification of Letters Patent.

Patented Sept. 9, 191.9.

Application led September 14, 1916. Serial No. 120,004..l

can be laid at a reasonable cost. Anotherobject is to provide a pavingwhich can be re-surfaced at small cost and to provide a wearing surfacewhich will protect the main body of the paving slab from the deleteriouseifects of changes inthe weather while the slab is in a state ofcuringas well as protecting the slab from the effects of traiiic. The improvedpaving is made capable of sustaining heavy trailic by the process setforth in the patent granted to me on April 13, 1909, No, 918,988. otherobjects and advantages will be fully explained in the followingdescription and the invention will be more fully pointed out in theclaims.

Reference is had to the accompanying drawings which form a part of thisapplication.

Figure 1 is a vertical section of a section of paving, showing thecondition of the materials as the paving is just being completed. Fig. 2is a vertical section of a completed section of paving.

Similar characters of reference are used to indicate the same partethroughout the several views.

The paving is illustrated in the drawings as being laid on the surfaceof graded earth i. Concrete is prepared in the usual manner with cement,sand, stone, and water, but with an increase in cement, sand and waterin order to provide a slight surplus of mortar. A concrete slab 2 isformed on the grade 1 by placing thereon enough plastic concrete to makea paving of the desired thickness. is laid, and before the concrete iscured or becomes hard or set, a wear resisting sur' face is formed byplacing additional stone or crushed granite 3 on the upper surface ofthe concrete and then forcing the additional stones down into theplastic concrete by placing thereon a platform and then vi- After theplastic concrete brating the stones 3 and the Whole slab of concretewith pressure7 as set forth in the above noted patent until the stonesare sunk into the surface of the concrete. More or less pressure can beused but the vibration and pressure must be simultaneously applied.' Theslab is then ready to be cured. In order that the curing may not beinterfered with, a wearing coating 4 is placed on top of the slab EZ toprotect the slab from the wear of the trailic or travel while beingcured and also to prevent heat or cold from vinterfering with the curingof the slab, and 'preventing the moisture from escaping from theinterior of the mass. The coating or wearing surface 4 may be thickenough to last several years. By the time the surface 4 is worn oft',the concrete slab will be thoroughly cured and the slab will have asmooth `hard surface composed of the stones ein bedded inthe concrete.The stone will be so embedded in the concrete and the concrete will be`So crystalized about the stone that the stone and concrete will be asone material and will form a surface that will be strong enough toresist the heaviest traflic and will resist Wear so that the life of thepaving will be prolonged. A surface will also be formed upon which a newwearing surface may be placed at very small cost. Thus a slab is formedwhich may be used simply as a substratum or which can be used as thesurface paving. It may be used a sub-stratum and recovered with awearing surface of bituminous or asphaltic consistency. Concrete willnot reach its full power of Tesistance until several months, and. whenused for street paving, must be given every pos- Y sible advantage andprotection before it is exposed to the severe test of active traffic.The surface coat 4. answers the .purpose of protecting the new laidconcrete.

What I claim, is:-

1. The herein described method of forrn ing paving which consists inlaying concrete on a prepared sub-grade, placingof stones on the surfaceof said concrete, and forcing the same b v vibration and pressure intosaid concrete while the concrete is in plastic condition for causing thestone to become an integral part of the mass.

2. The herein described method of formin paving for streets and likepurposes w ich consists in laying concrete containing a surplus ofmortar on a prepared subgrade, placing stones on the surface of theconc-rete and forcing the same down by y1- bration and pressuresimultaneously applied Yinto the concrete immediately after the concreteis laid thereby forcing the surplus mortar out of the concrete andforcing the stones in close relation.

3. The herein described method of forming paving for street-s and likepurposes which consists in laying concrete containing a surplus ofmoisture on a prepared sub-grade, placing stones on the surface of theconcrete and forcing the same by vibration and pressure down into theconcrete immediately after the concrete is laid 'thereby forcingn thesurplns mortar out othe concrete, and foinmimggn a moisture prodisurface course by the addition of surface,

grade to form a slab, placing stones on the surface of the concrete andforcingthe same down thereinby Vibration and pressure im.- mediatelyafter the concrete is laid, .causing the mortar of the concrete to becompacteol on all the surface of eat-listone for creating apermanentWearing surface.`

lln testimony whereof, I set my hand, this 9th day of September, 1916.

RUEERT C. STUBBS.

